$178 Find Cheap Flights from Ontario to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Ontario to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Seattle

Fri, Nov 20 - Mon, Nov 23
WestJet Logo
6:30 am - 1:20 pm
YYZ
-
SEA
9h 50m
1 stop
WestJet Logo
3:10 pm - 4:58 am
SEA
-
YYZ
10h 48m
2 stops
$297WestJet
Fri, Sep 11 - Mon, Sep 21
WestJet Logo
12:00 pm - 6:45 pm
YYZ
-
SEA
9h 45m
1 stop
WestJet Logo
7:35 pm - 6:55 am
SEA
-
YYZ
8h 20m
1 stop
$303WestJet
Tue, Sep 8 - Tue, Sep 15
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
WestJet Logo
10:30 am - 10:45 pm
SEA
-
YYZ
9h 15m
1 stop
$304WestJet
Fri, Sep 25 - Sat, Oct 3
WestJet Logo
12:00 pm - 6:45 pm
YYZ
-
SEA
9h 45m
1 stop
WestJet Logo
7:35 pm - 5:45 am
SEA
-
YYZ
7h 10m
1 stop
$305WestJet
Wed, Sep 9 - Thu, Sep 24
WestJet Logo
12:00 pm - 6:45 pm
YYZ
-
SEA
9h 45m
1 stop
WestJet Logo
10:30 am - 10:45 pm
SEA
-
YYZ
9h 15m
1 stop
$306WestJet
Wed, Oct 21 - Sat, Oct 24
Air Canada Logo
6:45 am - 10:42 pm
YTZ
-
SEA
18h 57m
2 stops
Air Canada Logo
5:40 am - 9:30 pm
SEA
-
YTZ
12h 50m
2 stops
$411Air Canada
Wed, Oct 21 - Sat, Oct 24
United Airlines Logo
7:25 pm - 9:36 am
YTZ
-
SEA
17h 11m
1 stop
United Airlines Logo
11:13 pm - 10:06 am
SEA
-
YTZ
7h 53m
1 stop
$442United Airlines
Wed, Oct 21 - Sat, Oct 24
United Airlines Logo
7:25 pm - 10:01 am
YTZ
-
SEA
17h 36m
2 stops
United Airlines Logo
1:56 pm - 10:06 am
SEA
-
YTZ
17h 10m
1 stop
$443United Airlines
Sat, Sep 5 - Fri, Sep 25
Multiple Airlines Logo
10:05 am - 6:16 pm
YTZ
-
SEA
11h 11m
1 stop
Multiple Airlines Logo
12:16 am - 2:25 pm
SEA
-
YTZ
11h 09m
1 stop
$483Multiple Airlines
Tue, Sep 1 - Mon, Sep 21
Multiple Airlines Logo
8:40 pm - 8:30 am
YTZ
-
SEA
14h 50m
1 stop
Multiple Airlines Logo
12:16 am - 2:25 pm
SEA
-
YTZ
11h 09m
1 stop
$488Multiple Airlines
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Good to know

Low seasonJanuary
Cheapest flight$178
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Toronto to Seattle

FAQs for booking flights from Ontario to Seattle

  • How does KAYAK find such low prices on flights from Ontario to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Mukilteo
Westport
Lacey
Woodinville
Poulsbo
Aberdeen
Edmonds
DuPont
Shoreline
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)